java function not found

I wrote this litte program. I compiled it and every time i try to run this applet i get the following
message:
Info :java.lang.NoSuchMethodError: java.awt.Component: method enableEvents(J)V not found

Can you please tell me why?



import java.awt.*;
import java.awt.event.*;
import java.applet.*;

class Blatt
extends Canvas
{

  private boolean clicked;
  private Point Position;

  public Blatt()
   { this.Position.x = 20;
     this.Position.y = 20;
     this.clicked = false;
     enableEvents(AWTEvent.MOUSE_EVENT_MASK);
   }

   public Blatt(Point Punkt)
   {
      this.Position = Punkt;
      this.clicked = false;
      enableEvents(AWTEvent.MOUSE_EVENT_MASK);
   }

   public void paint(Graphics g)
   {
     if(!this.clicked)
      g.drawRect(this.Position.x,this.Position.y,20,20);
     else
     {
       g.fillRect(this.Position.x,this.Position.y,20,20);
     }
   }

     protected void processMouseEvent(MouseEvent event)
   {

      if (event.getID() == MouseEvent.MOUSE_PRESSED)
        {
         if (clicked) clicked = false ;
           else
            clicked = true;

        }
         repaint();

      super.processMouseEvent(event);
   }
}


public class BrainApplet extends Applet
{

       public void init()
       {
        Blatt b = new Blatt();
        add(b);
        validate();
       }

        public void paint(Graphics g)
         {
             g.drawString("Welcome to this tutorial! Value ", 20, 20);
         }

}